Well Rah, seeing as how Moradin isn't an established deity in Eberron, I'm going to offer you some other choices.
I'm pretty sure Sj doesn't care if your Cleric worships Moradin, so don't feel it necessary to change. These are only options, that would help you fit in to the setting more fluidly.
Based on the Domains of Good and Protection, also following Lawful Good as an alignment, the two deities in Eberron that you'd fit in best with are The Church of the Silver Flame or Boldrei, God of Community and Hearth.
A little info about each can be found in the following links
The Church of the Silver Flame
My personal notes are that the Silver Flame are a bunch of "destroy all evil" religious zealots. I, personally don't like them and generally don't like to play them, but may that's what you've envisioned for your character, so I present it to you.
The Sovereign Host (including the Goddess, Boldrei)
Boldrei's religion, being part of the pantheon of deities known as The Sovereign Host, is a little more classier and relaxed religion. Her followers still take a firm stand against evil, but they let trouble come to them instead of going out and hunting for it like the Silver Flame.
It's kinda like the difference between your average do-gooder and George W. Bush.
Average Do-Gooder = Boldrei
George W. Bush = Silver Flame